/*

 * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt.image;

import java.awt.geom.AffineTransform;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

import java.awt.image.BufferedImageOp;

import java.awt.image.ByteLookupTable;

import java.awt.image.ConvolveOp;

import java.awt.image.Kernel;

import java.awt.image.LookupOp;

import java.awt.image.LookupTable;

import java.awt.image.RasterOp;

import java.awt.image.Raster;

import java.awt.image.WritableRaster;

import java.security.AccessController;

import java.security.PrivilegedAction;

/**

 * This class provides a hook to access platform-specific

 * imaging code.

 *

 * If the implementing class cannot handle the op, tile format or

 * image format, the method will return null;

 * If there is an error when processing the

 * data, the implementing class may either return null

 * (in which case our java code will be executed) or may throw

 * an exception.

 */

public class ImagingLib {

    static boolean useLib = true;

    static boolean verbose = false;

    private static final int NUM_NATIVE_OPS = 3;

    private static final int LOOKUP_OP   = 0;

    private static final int AFFINE_OP   = 1;

    private static final int CONVOLVE_OP = 2;

    private static Class[] nativeOpClass = new Class[NUM_NATIVE_OPS];

    /**

     * Returned value indicates whether the library initailization was

     * succeded.

     *

     * There could be number of reasons to failure:

     * - failed to load library.

     * - failed to get all required entry points.

     */

    private static native boolean init();

    static public native int transformBI(BufferedImage src, BufferedImage dst,

                                         double[] matrix, int interpType);

    static public native int transformRaster(Raster src, Raster dst,

                                             double[] matrix,

                                             int interpType);

    static public native int convolveBI(BufferedImage src, BufferedImage dst,

                                        Kernel kernel, int edgeHint);

    static public native int convolveRaster(Raster src, Raster dst,

                                            Kernel kernel, int edgeHint);

    static public native int lookupByteBI(BufferedImage src, BufferedImage dst,

                                        byte[][] table);

    static public native int lookupByteRaster(Raster src, Raster dst,

                                              byte[][] table);

    static {

        PrivilegedAction<Boolean> doMlibInitialization =

            new PrivilegedAction<Boolean>() {

                public Boolean run() {

                    String arch = System.getProperty("os.arch");

                    if (arch == null || !arch.startsWith("sparc")) {

                        try {

                            System.loadLibrary("mlib_image");

                        } catch (UnsatisfiedLinkError e) {

                            return Boolean.FALSE;

                        }

                    }

                    boolean success =  init();

                    return Boolean.valueOf(success);

                }

            };

        useLib = AccessController.doPrivileged(doMlibInitialization);

        //

        // Cache the class references of the operations we know about

        // at the time this class is initially loaded.

        //

        try {

            nativeOpClass[LOOKUP_OP] =

                Class.forName("java.awt.image.LookupOp");

        } catch (ClassNotFoundException e) {

            System.err.println("Could not find class: "+e);

        }

        try {

            nativeOpClass[AFFINE_OP] =

                Class.forName("java.awt.image.AffineTransformOp");

        } catch (ClassNotFoundException e) {

            System.err.println("Could not find class: "+e);

        }

        try {

            nativeOpClass[CONVOLVE_OP] =

                Class.forName("java.awt.image.ConvolveOp");

        } catch (ClassNotFoundException e) {

            System.err.println("Could not find class: "+e);

        }

    }

    private static int getNativeOpIndex(Class opClass) {

        //

        // Search for this class in cached list of

        // classes supplying native acceleration

        //

        int opIndex = -1;

        for (int i=0; i<NUM_NATIVE_OPS; i++) {

            if (opClass == nativeOpClass[i]) {

                opIndex = i;

                break;

            }

        }

        return opIndex;

    }

    public static WritableRaster filter(RasterOp op, Raster src,

                                        WritableRaster dst) {

        if (useLib == false) {

            return null;

        }

        // Create the destination tile

        if (dst == null) {

            dst = op.createCompatibleDestRaster(src);

        }

        WritableRaster retRaster = null;

        switch (getNativeOpIndex(op.getClass())) {

          case LOOKUP_OP:

            // REMIND: Fix this!

            LookupTable table = ((LookupOp)op).getTable();

            if (table.getOffset() != 0) {

                // Right now the native code doesn't support offsets

                return null;

            }

            if (table instanceof ByteLookupTable) {

                ByteLookupTable bt = (ByteLookupTable) table;

                if (lookupByteRaster(src, dst, bt.getTable()) > 0) {

                    retRaster = dst;

                }

            }

            break;

          case AFFINE_OP:

            AffineTransformOp bOp = (AffineTransformOp) op;

            double[] matrix = new double[6];

            bOp.getTransform().getMatrix(matrix);

            if (transformRaster(src, dst, matrix,

                                bOp.getInterpolationType()) > 0) {

                retRaster =  dst;

            }

            break;

          case CONVOLVE_OP:

            ConvolveOp cOp = (ConvolveOp) op;

            if (convolveRaster(src, dst,

                               cOp.getKernel(), cOp.getEdgeCondition()) > 0) {

                retRaster = dst;

            }

            break;

          default:

            break;

        }

        if (retRaster != null) {

            SunWritableRaster.markDirty(retRaster);

        }

        return retRaster;

    }

    public static BufferedImage filter(BufferedImageOp op, BufferedImage src,

                                       BufferedImage dst)

    {

        if (verbose) {

            System.out.println("in filter and op is "+op

                               + "bufimage is "+src+" and "+dst);

        }

        if (useLib == false) {

            return null;

        }

        // Create the destination image

        if (dst == null) {

            dst = op.createCompatibleDestImage(src, null);

        }

        BufferedImage retBI = null;

        switch (getNativeOpIndex(op.getClass())) {

          case LOOKUP_OP:

            // REMIND: Fix this!

            LookupTable table = ((LookupOp)op).getTable();

            if (table.getOffset() != 0) {

                // Right now the native code doesn't support offsets

                return null;

            }

            if (table instanceof ByteLookupTable) {

                ByteLookupTable bt = (ByteLookupTable) table;

                if (lookupByteBI(src, dst, bt.getTable()) > 0) {

                    retBI = dst;

                }

            }

            break;

          case AFFINE_OP:

            AffineTransformOp bOp = (AffineTransformOp) op;

            double[] matrix = new double[6];

            AffineTransform xform = bOp.getTransform();

            bOp.getTransform().getMatrix(matrix);

            if (transformBI(src, dst, matrix,

                            bOp.getInterpolationType())>0) {

                retBI = dst;

            }

            break;

          case CONVOLVE_OP:

            ConvolveOp cOp = (ConvolveOp) op;

            if (convolveBI(src, dst, cOp.getKernel(),

                           cOp.getEdgeCondition()) > 0) {

                retBI = dst;

            }

            break;

          default:

            break;

        }

        if (retBI != null) {

            SunWritableRaster.markDirty(retBI);

        }

        return retBI;

    }

}